苹果银叶病及其防治苹果树银叶病是一种真菌病害。树体感病后，叶片正面呈死灰色并略带银白色光泽，入秋后叶片上产生不规则褐色锈斑；叶表部分破裂，叶肉裸露而由绿变褐；受害枝条表皮呈油纸状。受害苹果树，树势骤减、果实变小、产量降低，严重的２～３年内全株枯死。银... Silver leaf disease and control of apple tree Silver leaf disease is a fungal disease. After the tree was infected with disease, the leaves appeared dead gray and slightly silvery white on the obverse, and irregular brown rust appeared on the leaves after autumn. The leaf surface was partially broken and the mesophyll was exposed but the green was browned. The epidermis of the damaged branches was oily paper. Victims of apple trees, tree drastic reduction in fruit smaller, lower yields, severe 2 to 3 years the whole plant died. silver...